Having the worst traffic can mean the worst accidents, worst pollution, worst crowding, worst commutes and a host of other ugly conditions and experiences.
1. Los Angeles, CA
2. San Francisco, CA
3. Denver, CO
4. Miami, FL
5. Phoenix, AZ
6. Chicago, IL
7. San Jose, CA
8. Washington, DC
9. Portland, OR
10. Boston, MA
Population: 1,581,000
Population: 15.2 million (official) / 25 million (unofficial)
Population: 10 million to 15 million
Population: 508,500
Population: 10,297,000 (20 million-plus metro area)
Population: 6,724,976 (11 million-plus metro area)
Population: 2,776,138 (12 million-plus metro area)
Population: 8,792,000
Population: of 1,510,577
Population: 2,530,000
Via Forbes.com